Riddle - Story of Devil Complete Series [Z2]

Tokaku Azuma is a heartless teenage assassin who has been sent to a prestigious, all-girls boarding school to compete in an assassination game against eleven other killers. Their heinous mission: send the innocent and cheerful Haru Ichinose to an early grave. But when Tokaku finds herself strangely drawn to her intended target, she must utilize her lethal skills to keep her new friend alive...